Here's why:

* Widgets are building blocks: They are the fundamental elements of a GUI, providing visual components like buttons, text boxes, sliders, menus, etc.

* Interactive elements: Widgets allow users to interact with the GUI by clicking, dragging, typing, etc.

* Graphical representation: They provide the graphical representation of data and functionality within the application.

So, while the entire GUI is the graphical user interface, individual widgets are the specific devices used to work with graphical objects within it.